x^2+18x=108

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Solution for x^2+18x=108 equation:


Simplifying
x2 + 18x = 108

Reorder the terms:
18x + x2 = 108

Solving
18x + x2 = 108

Solving for variable 'x'.

Reorder the terms:
-108 + 18x + x2 = 108 + -108

Combine like terms: 108 + -108 = 0
-108 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + 18x + 108 + x2 = 0 + 108

Reorder the terms:
-108 + 108 + 18x + x2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + 18x + x2 = 0 + 108
18x + x2 = 0 + 108

Combine like terms: 0 + 108 = 108
18x + x2 = 108

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 108 + 81

Reorder the terms:
81 + 18x + x2 = 108 + 81

Combine like terms: 108 + 81 = 189
81 + 18x + x2 = 189

Factor a perfect square on the left side:
(x + 9)(x + 9) = 189

Calculate the square root of the right side: 13.747727085

Break this problem into two subproblems by setting 
(x + 9) equal to 13.747727085 and -13.747727085.

Subproblem 1

x + 9 = 13.747727085 Simplifying x + 9 = 13.747727085 Reorder the terms: 9 + x = 13.747727085 Solving 9 + x = 13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 13.747727085 + -9 Combine like terms: 9 + -9 = 0 0 + x = 13.747727085 + -9 x = 13.747727085 + -9 Combine like terms: 13.747727085 + -9 = 4.747727085 x = 4.747727085 Simplifying x = 4.747727085

Subproblem 2

x + 9 = -13.747727085 Simplifying x + 9 = -13.747727085 Reorder the terms: 9 + x = -13.747727085 Solving 9 + x = -13.747727085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -13.747727085 + -9 Combine like terms: 9 + -9 = 0 0 + x = -13.747727085 + -9 x = -13.747727085 + -9 Combine like terms: -13.747727085 + -9 = -22.747727085 x = -22.747727085 Simplifying x = -22.747727085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.747727085, -22.747727085}

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